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Groan going into autostop

   
Old Dec 28, 2017 | 05:54 AM
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Default Groan going into autostop
I've had my truck almost 4 years. 09 sierra 4wd 172k miles. Since it got cold this year every time it goes in autostop it makes a couple of Groan noises. I have a tech 2 and everything seems to check out. Any ideas? Comes from under the hood
 
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Old Jan 2, 2018 | 07:19 AM
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Default Re: Groan going into autostop
It could be the sound of the Auxiliary Pump ramping up speed.


Use the Tech 2 to monitor the speed of that pump as it spins up.
 
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Old Jan 2, 2018 | 08:02 AM
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Default Re: Groan going into autostop
Originally Posted by Hillbilly_Hybrid
It could be the sound of the Auxiliary Pump ramping up speed.


Use the Tech 2 to monitor the speed of that pump as it spins up.
what should the speed be? I made video of it. Unsure how to upload it on here.
 
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Old Jan 2, 2018 | 03:12 PM
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Default Re: Groan going into autostop
It ended up being the throttle body
 
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Old Jan 24, 2018 | 10:24 AM
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Default Re: Groan going into autostop
update: the truck went into reduced power mode. 4 or 5 tb related codes so I put a new one and relearned the idle and that fixed my issue
 
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